i dont know if its true, but i saw a post from prozajik in past where he said forum time is different for everyone
Not sure if it was me, but this was an issue before. In some past tourney, nobody thought that going by forum time is a problem up until it was too late. I think the default forum time is GMT +0, but you can definitely change it.
GMT +X means that you add X hours to the GMT +0 time to get 'correct' time estimate.
GMT +0 is Greenwich London (more:
https://upload.wikimedia.org/wikipedia/commons/e/e8/Standard_World_Time_Zones.png)
Also, most of the timezones have a name, for example CET - Central European Time = GMT +1
So if we have 12:00 in Czech republic (which is in GMT +1) then the GMT +0 time is 11:00
It gets kind of complicated when you have to take summer time into account, but w/e. You can basically just pick a timezone and say that the tourney is going to be in that timezone (preferably probably your local timezone, since then you get an idea of when it is gonna be). If you want, I could then just 'calculate' the other timezones.